Fractal characteristics of the ground-observed ULF emissions in relation to geomagnetic and seismic activities |
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| Institution: | 1. Institute of Physics, St. Petersburg University, Ul’yanovskaya Street, 1, St. Petersburg 198504, Russia;2. The University of Electro-Communications, 1-5-1, Chofugaoka, Chofu, Tokyo 182-8585, Japan;1. Institute of Geophysics, ETH, Zürich, Switzerland;2. Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California, San Diego, USA;3. Division of Geomagnetism, National Space Institute, Technical University of Denmark, Kgs. Lyngby, Denmark;1. School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China;2. Academy of Disaster Reduction and Emergency Management, Beijing Normal University, Beijing 100875, China;3. Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China;1. Department of Electrical & Computer Engineering, Aristotle University of Thessaloniki, Thessaloniki, Greece;2. Department of Surveying & Geodesy, Aristotle University of Thessaloniki, Thessaloniki, Greece;1. Space Science Division, Korea Astronomy and Space Science Institute, Daejeon 305-348, South Korea;2. Department of Electronics Engineering, Chungnam National University, Daejeon 305-764, South Korea |
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| Abstract: | Results of fractal analysis of ultra-low-frequency (ULF) emissions registered at a low-latitude observatory, Guam (geomagnetic coordinates Φm=9°N, Λm=225°), and at a high-latitude drifting station, North Pole-30 (Φm=75°N, Λm=172°), are presented. The first set of data covers a long period of observations (20 months) including the strong (Ms=8) Guam earthquake of 8 August 1993. The second set of data covers a short period of observations (21 days) in April 1989 during the preparation phase of the big magnetic storm of 25 April 1989. Definite peculiarities in the behavior of ULF emission scaling (fractal) characteristics have been found, which are discussed on the basis of the self-organized criticality concept. The principal common peculiarity for magnetosphere–ionosphere and lithosphere systems is detection of flicker noise (β～1, D0～2) in a certain frequency range on the preparation phase of strong magnetospheric and seismic events. |
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